version 1.16, 2002/11/24 13:54:02
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version 1.22, 2003/03/09 15:17:04
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/* This file defines a number of threading schemes. |
/* This file defines a number of threading schemes. |
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Copyright (C) 1995, 1996,1997,1999 Free Software Foundation, Inc. |
Copyright (C) 1995, 1996,1997,1999,2003 Free Software Foundation, Inc. |
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This file is part of Gforth. |
This file is part of Gforth. |
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*/ |
*/ |
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#ifdef DOUBLY_INDIRECT |
#ifdef DOUBLY_INDIRECT |
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# ifndef DEBUG_DITC |
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# define DEBUG_DITC 0 |
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# endif |
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/* define to 1 if you want to check consistency */ |
# define NEXT_P0 ({cfa=*ip;}) |
# define NEXT_P0 ({cfa=*ip;}) |
# define IP (ip) |
# define IP (ip) |
# define SET_IP(p) ({ip=(p); NEXT_P0;}) |
# define SET_IP(p) ({ip=(p); NEXT_P0;}) |
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# define INC_IP(const_inc) ({cfa=IP[const_inc]; ip+=(const_inc);}) |
# define INC_IP(const_inc) ({cfa=IP[const_inc]; ip+=(const_inc);}) |
# define DEF_CA Label ca; |
# define DEF_CA Label ca; |
# define NEXT_P1 ({\ |
# define NEXT_P1 ({\ |
if (cfa<=vm_prims+DOESJUMP || cfa>=vm_prims+npriminfos) \ |
if (DEBUG_DITC && (cfa<=vm_prims+DOESJUMP || cfa>=vm_prims+npriminfos)) \ |
fprintf(stderr,"NEXT encountered prim %p at ip=%p\n", cfa, ip); \ |
fprintf(stderr,"NEXT encountered prim %p at ip=%p\n", cfa, ip); \ |
ip++; ca=**cfa;}) |
ip++;}) |
# define NEXT_P2 ({goto *ca;}) |
# define NEXT_P2 ({ca=**cfa; goto *ca;}) |
# define EXEC(XT) ({DEF_CA cfa=(XT);\ |
# define EXEC(XT) ({DEF_CA cfa=(XT);\ |
if (cfa>vm_prims+DOESJUMP && cfa<vm_prims+npriminfos) \ |
if (DEBUG_DITC && (cfa>vm_prims+DOESJUMP && cfa<vm_prims+npriminfos)) \ |
fprintf(stderr,"EXEC encountered xt %p at ip=%p, vm_prims=%p, xts=%p\n", cfa, ip, vm_prims, xts); \ |
fprintf(stderr,"EXEC encountered xt %p at ip=%p, vm_prims=%p, xts=%p\n", cfa, ip, vm_prims, xts); \ |
ca=**cfa; goto *ca;}) |
ca=**cfa; goto *ca;}) |
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#if defined(DIRECT_THREADED) |
#if defined(DIRECT_THREADED) |
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/* This lets the compiler know that cfa is dead before; we place it at |
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"goto *"s that perform direct threaded dispatch (i.e., not EXECUTE |
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etc.), and thus do not reach doers, which would use cfa; the only |
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way to a doer is through EXECUTE etc., which set the cfa |
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themselves. |
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Some of these direct threaded schemes use "cfa" to hold the code |
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address in normal direct threaded code. Of course we cannot use |
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KILLS there. |
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KILLS works by having an empty asm instruction, and claiming to the |
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compiler that it writes to cfa. |
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KILLS is optional. You can write |
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#define KILLS |
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and lose just a little performance. |
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*/ |
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#define KILLS asm("":"=X"(cfa)); |
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#ifndef THREADING_SCHEME |
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#define THREADING_SCHEME 6 |
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#endif |
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#if THREADING_SCHEME==1 |
#if THREADING_SCHEME==1 |
#warning direct threading scheme 1: autoinc, long latency, cfa live |
#warning direct threading scheme 1: autoinc, long latency, cfa live |
# define NEXT_P0 ({cfa=*ip++;}) |
# define NEXT_P0 ({cfa=*ip++;}) |
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# define INC_IP(const_inc) ({ ip+=(const_inc);}) |
# define INC_IP(const_inc) ({ ip+=(const_inc);}) |
# define DEF_CA |
# define DEF_CA |
# define NEXT_P1 |
# define NEXT_P1 |
# define NEXT_P2 ({goto **(ip-1);}) |
# define NEXT_P2 ({KILLS goto **(ip-1);}) |
# define EXEC(XT) ({cfa=(XT); goto **cfa;}) |
# define EXEC(XT) ({cfa=(XT); goto **cfa;}) |
#endif |
#endif |
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# define INC_IP(const_inc) ({ ip+=(const_inc);}) |
# define INC_IP(const_inc) ({ ip+=(const_inc);}) |
# define DEF_CA |
# define DEF_CA |
# define NEXT_P1 |
# define NEXT_P1 |
# define NEXT_P2 ({goto **(ip++);}) |
# define NEXT_P2 ({KILLS goto **(ip++);}) |
# define EXEC(XT) ({cfa=(XT); goto **cfa;}) |
# define EXEC(XT) ({cfa=(XT); goto **cfa;}) |
#endif |
#endif |
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# define INC_IP(const_inc) ({ip+=(const_inc);}) |
# define INC_IP(const_inc) ({ip+=(const_inc);}) |
# define DEF_CA |
# define DEF_CA |
# define NEXT_P1 (ip++) |
# define NEXT_P1 (ip++) |
# define NEXT_P2 ({goto **(ip-1);}) |
# define NEXT_P2 ({KILLS goto **(ip-1);}) |
# define EXEC(XT) ({cfa=(XT); goto **cfa;}) |
# define EXEC(XT) ({cfa=(XT); goto **cfa;}) |
#endif |
#endif |
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# define INC_IP(const_inc) ({ ip+=(const_inc);}) |
# define INC_IP(const_inc) ({ ip+=(const_inc);}) |
# define DEF_CA |
# define DEF_CA |
# define NEXT_P1 (ip++) |
# define NEXT_P1 (ip++) |
# define NEXT_P2 ({goto **(ip-1);}) |
# define NEXT_P2 ({KILLS goto **(ip-1);}) |
# define EXEC(XT) ({cfa=(XT); goto **cfa;}) |
# define EXEC(XT) ({cfa=(XT); goto **cfa;}) |
#endif |
#endif |
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#else |
#else |
/* indirect THREADED */ |
/* indirect THREADED */ |
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#ifndef THREADING_SCHEME |
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#define THREADING_SCHEME 6 |
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#endif |
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#if THREADING_SCHEME==1 |
#if THREADING_SCHEME==1 |
#warning indirect threading scheme 1: autoinc, long latency, cisc |
#warning indirect threading scheme 1: autoinc, long latency, cisc |
# define NEXT_P0 ({cfa=*ip++;}) |
# define NEXT_P0 ({cfa=*ip++;}) |